Arched roof



March '1, 1933. J. Rom ARCHED ROOF Filed March 25, 1951 CTR Patented Mar. 7, 1933 'raras @TENT OFFIC JAN BRDA, OF TOlZU'IT, POLAND ARCHED ROOF Application filed March 3, 193i, SeralNo.

siderable span, say ten to sixty meters and more. Such roofs usually comprise a number of trusses arranged at considerable distances, say five meters or more apart, ar-

ranged in the transverse direction ofthe roof, and made either of iron or wood in the 'form of lattice girders orframeworh girders|- or of ferro-concrete. These transverse trusses support either directly or by means of longitudinal beams or purlins the arched roof cover made of any suitable material, such as corrugated iron, ferro-concrete, or wood.

In these known constructions the trusses bear the total load, that is, their own load,

lthe load of the longitudinal beams or battens,

the load of the roof cover and also the accidental loads due to the load of thc snow, the wind pressure and other accidental loads.

Consequently, the trusses mustbe made of sufficient strength, and it is moreover, particularly in the case of great spans, advisable to reduce the weight and the thickness of the roof cover as far as possible.

According to the invention an arched roof comprising transverse trusses and an arched roof cover supported on such trusses preferably by means of longitudinal beams is characterized by the fact that the roof cover is constructed as a continuous arch or vault which is at its longitudinal edges firmly supported by longitudinal abutments in such a manner that the roof cover acts as an arch capable of transmitting normal stresses within the roof arch, that is, stresses acting at right angles to the cross sections of the roof arch, directly to the longitudinal abutments, the latter being, of course, maintained at the required horizontal distance apart by suitable ties. The result is that the transverse trusses (and longitudinal beams or reinforcing ribs, if any) which support the roof arch, are not called upon to carry the load of the roof arch, which as stated above, as normal stresses in the roof arch, is directly taken of example three roof constructions embody- 52498, and in Germany March 30, 1930.

up by the longitudinal abutments, but serve substantially only to prevent deformation r Vbreaking of the roof arch under the action of the bending moments which the loads pro duce in the roof arch.

As the roof arch does not transmit bending moments, but only normal stresses, its thickness may be comparatively very small, and consequently its weight will also be very,Y email. On the other hand, as the transverse trusses do not have to take up normal stresses from the roof arch', they may be designed inucn lighter than the trusses of the known roof constructions which have to carry all the loads. The main advantage of the invention therefore .resides in the fact that, Whereas in the old constructions, the trusses .take up both the normal stresses and the bending moments, they have, in the construction` forming the subject of the invention, only '70 the function of taking up the bending moments, while the internal normal stresses are taken up by the arched roof.

lt will be understood that any form of arched roof may be used which is capable of transferring a load in the form of internal stresses to longitudinal abutments.

rlhe accompanying drawing shows by way ing the features of the invention.

F ig. 1 is a perspective view 0f the rst construction,

Fig. 2 is a perspective detail view showing the manner in which the roof cover issupported by the longitudinal abutments, u

Fig. 3 shows in perspective a second construction, and

Fig. 4t is a similar view of a third construction. y; 9()

Referring to Figs. 1 and 2 the roof cover 1 is made of wooden boards 2 bent to the curvature of the cover. The ends of the roof cover are rigidly mounted, that is, let into longitudinal abutment beams 3 which are V495 held at a constant distance by means of transverse ties 4. The roof cover 1 rests upon ylongitudinal beams or purlins 5 which in turn are supported by transverse trusses 6 constructed in the form of lattice girders. 10() 7 are pillars or Walls supporting the trusses and the longitudinal beams.

In the construction shovvn in Fig. 3 the roof cover 1 is supported and constructed in exactly the same manner as in the construction shown in Figs. 1 and 2. rEhe transverse trusses 8 in this construction are made entirely as Wooden lattice girders and they are supported and partly combined With vertical columns 9 on which thelongitudinal abutment beams 3 also rest. 10, 10 indicate lateral Wings iXed at suitable points of the root cover and serving for the protection of the side Walls 11.

In the construction shown in Fig. l the cover 1 is made of reinforced concrete, the longitudinal abutments being also made as terroconcrete beams 12. The transverse trusses 13 are also made of 'ferro-concrete. The ties lier holding horizontally the abutment-s 12 are suspended from the transverse trusses by means of tension members 14.

I claim:

1. An arched roof, comprising in combination: an arched root cover constructed as a substantially continuous arch; longitudinal abutments for supporting said arched roof cover; means for holding said longitudinal abutments at a constant distance, said arched roof cover being at its longitudinal edges iirmly supported by the said longitudinal abutments, whereby said arched roof cover acts as an arch capable of transmitting` longitudinal stresses directly to the longitudinal abutments; transverse trusses supporting said arched roof cover at numerous points intermediate oi the longitudinal abutinents; and means for supporting said transverse trusses, substantially as described.

2. An arched roof, comprising in combination: an arched root cover constructed as a substantially continuous arch; longitudinal abutments` for supporting said arched roof cover; ties for holding said longitudinal abutments at a constant distance, said arched roof cover being at its longitudinal edges firmly supported by said longitudinal abutments, whereby said arched rooi:` cover acts as an arch capable o transmitting internal normal stresses directly to the longitudinal abutments; transverse trusses supporting the said arched roof cover at numerous points intermediate of the longitudinal abutments and serving substantially only to prevent deformation or breaking of the arched roof cover under the action of bending moments; and supports for said transverse trusses, sub stantially as described.

8. An arched roof, comprising in combination: a Wooden arched roof cover`constructed as a substantially continuous arch; longitudinal abutments supporting said Wooden arched roof cover; ties for holding said longitudinal abutments at a constant distance apart; said. Wooden arched roof cover being rigidly mounted in said longitudinal abutments; and transverse trusses supporting said Wooden arched roof cover at numerous points intermediate of the said longitudinal abutments; and means for supporting said transverse trusses, substantially as described.

fr. An arched roof, comprising in combination: a Wooden arched roof cover made of Wooden boards bent to the curvature of the cover and constructed as a substantially continuous arch; longitudinal abutment beams iorsupporting said Wooden arched root cover; transverse ties for holding said longitudinal abutment beams at a constant distance, said Wooden arched roof cover being rigidly mounted at its longitudinal ends in said longitudinal abutment beams; transverse trusses constructed in the form of lattice girders; means 'for supporting the trusses and the longitudinal beams; said Wooden arched root cover being provided with longitudinal purlins which are supported by the said transverse trusses, substantially as described.

5. in arched roof comprising in combination: an arched root cover constructed as a substantially continuous arch; longitudinal abutments for supporting said arched root cover, the longitudinal edges of the latter being rigidly mounted in said longitudinal abutments; transverse ties for holding said longitudinal abutments at a constant distance apart; means for supporting said longitudinal abutments; longitudinal purlins for supporting said arched roof cover at numerous points intermediate of said longitudinal abutments; transverse trusses for supporting said longitudinal purlins; and means for supporting said transverse trusses independently of said longitudinal abutments, substantially as described.

ln testimony whereof I aiix my signature.

JAN BRODA.

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